Can You Add 92 Octane Gasoline After Filling Up with 95 Octane?
1 Answers
If both 92 and 95 octane gasoline are within the vehicle's allowable range and are not mixed, you can add 92 octane gasoline after filling up with 95 octane. However, if 92 octane is not within the manufacturer's recommended gasoline grade, it should not be used. Unauthorized reduction of the gasoline grade may not show obvious effects in the short term, but over time, it can cause engine knocking, insufficient engine power, and loud knocking sounds. It is advisable to consistently use one type of gasoline, as mixing different grades can negatively affect the engine and fuel system. If you are concerned about the potential harm of mixing gasoline, you can remove the fuel tank, drain all the fuel (including the fuel in the fuel pump), clean the fuel tank, fuel lines, and combustion chamber, replace the fuel filter, and then refuel. Every engine undergoes a comprehensive evaluation before leaving the factory. Based on the engine's performance and other data characteristics, the manufacturer specifies the required anti-knock properties, which determine the appropriate gasoline grade to use. Therefore, refueling should follow the engine's compression ratio or the most suitable gasoline grade recommended in the vehicle's user manual. This approach is more scientific, economical, and allows the engine to operate at maximum efficiency. The gasoline grade represents the octane rating of the gasoline. For example, 92 octane gasoline consists of approximately 92% isooctane and 8% n-heptane. Since isooctane has better anti-knock properties and n-heptane has poorer anti-knock properties, a higher octane rating indicates better anti-knock performance of the gasoline.
